Antennas for GNSS and LTE

[DiegoMinatto]

I´m trying to design a compact circuit for the NRF91, since i have limited space i´m planning to do a board stackup with the antenna board on top. Right now my board is 50mm x 25mm, i´m getting arround 60% efficiency and a S11 bellow -8 db for frequencyes higher than 1,6 GHZ on my simulations.

If i would to place another antenna on the opposite side, just for GNSS, but keeping the same size of ground plane, would both antennas have the same efficiency for that size of ground plane or it would be affected ?

Here is an example on how the antennas would be placed:

Any suggestions or considerations for this size of application ?

[Michal]

Hello,

What kind of antennas are you using? Are they chip or trace antennas?

Best regards,

Michal

[DiegoMinatto]

Hello, they are chip antennas from ignion.

[Michal]

Since Ignion is our Solution Partner I think you should ask them as well about the antenna performance in that situation, they may be able to provide some better information.

Personally I think that they shouldn't be affected, since you cannot do both GNSS and LTE at the same time anyway.

Best regards,

Michal

[DiegoMinatto]

I gonna ask them about it and post the results here after.

Thanks Michal.

[Michal]

You're welcome, please let me know afterwards.

Best regards,

Michal